Which Directional Coupler do you use?

Not a burning question, but it’s a rainy day and I am curious. I started out with the Mini-Circuits ZFDC-10-5-S+, but was not totally happy with the performance re: directivity and reflections and of course frequency limited. Moved to a scavenged KMW KCDSR30-31 bidirectional coupler and was quite pleased with the improvement. So what do you use and are you happy with it?

I have been using the ZFDC-20-5+ by MiniCircuits for several years. It is good from 100kHz to 2 GHz. Attached are some VNA plots I took. Works great with the tracking GEN. Above this freq I use Narda transmission line couplers. They are a little bit more expensive.

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Hi Phil,
If you have time, could you advise the spec of your KCDSR30-31?
I can’t find any info about it on the net unfortunately.

Thanks,
Roger

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